I am attempting to hook up a 12-volt water pump to an 110 outlet.

I bought an AC/DC switching adapter to make the conversion. Intended on wiring a black and red wire to a black and red wire. But my power brick also has a blue and white wire. I'm assuming these are some sort of feedback wires for the protection of PSU's but I don't know what to do with them.

When I ignore them and just hook up the red and black wires the power supply decides to stop sending power through, it shoots small test bursts of electricity through and never powers the pump. is there an easy way to override the protection mechanism if that is what is happening? If that is not the issue what are the white and blue wires?

Power brick specs:

brand: MeanWell

model#: GS220A12

Input: 100-240VAC, 50/60Hz, 4.0A

Output: 12v 15A, 180w MAX

  • \$\begingroup\$ I'm going to guess you cut the 4-pin plug off the end of the cable and that's where you're getting those red/black/blue/white wires? \$\endgroup\$
    – brhans
    Aug 9, 2017 at 15:15
  • \$\begingroup\$ What is the max current draw of the pump? \$\endgroup\$
    – Voltage Spike
    Aug 9, 2017 at 15:18
  • \$\begingroup\$ I would be concerned about that as a supply. DIN-4 pin plugs don't generally have a high current rating. Even DIN-4 power plugs only go up to 10A maximum usually. \$\endgroup\$
    – R Drast
    Aug 9, 2017 at 15:35
  • \$\begingroup\$ Measure them with a multimeter. \$\endgroup\$
    – winny
    Aug 9, 2017 at 16:00
  • \$\begingroup\$ @brhans yes I cut off the 4 pin plug \$\endgroup\$ Aug 9, 2017 at 19:12

1 Answer 1


A quick look at the datasheet (that you didn't link to) shows that there is a 4-pin connector.

enter image description here

  • Measure each pin relative to the black wire.
  • Assuming that two of them give you a +12 V reading twist those two together. They're your positive.
  • Twist the other two together. They're your negative.
  • \$\begingroup\$ I will try this as soon as I get back and let you know what happens \$\endgroup\$ Aug 9, 2017 at 19:16
  • 1
    \$\begingroup\$ @Riley. It's 2020 and you never got back to us as you promised. What happened? \$\endgroup\$
    – Transistor
    Feb 8, 2020 at 11:11

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